1 // RUN: %clangxx_msan -std=c++11 -O0 -g %s -o %t && %run %t
2 // RUN: %clangxx_msan -DPOSITIVE -std=c++11 -O0 -g %s -o %t && not %run %t 2>&1 | FileCheck %s
3 
4 #include <assert.h>
5 #include <signal.h>
6 #include <sys/time.h>
7 #include <unistd.h>
8 
9 #include <sanitizer/msan_interface.h>
10 
11 void test_sigwait() {
12   sigset_t s;
13 #ifndef POSITIVE
14   sigemptyset(&s);
15   sigaddset(&s, SIGUSR1);
16 #endif
17   sigprocmask(SIG_BLOCK, &s, 0);
18   // CHECK:  MemorySanitizer: use-of-uninitialized-value
19 
20   if (pid_t pid = fork()) {
21     kill(pid, SIGUSR1);
22     _exit(0);
23   } else {
24     int sig;
25     int res = sigwait(&s, &sig);
26     assert(!res);
27     // The following checks that sig is initialized.
28     assert(sig == SIGUSR1);
29   }
30 }
31 
32 int main(void) {
33   test_sigwait();
34   return 0;
35 }
36